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Tag: "low" at biology news

Prostate cancer uses Wnt signaling proteins to promote growth of bone tumors

...astic activity had high levels of Wnt activity and low levels of DKK-1, while cells with osteolytic activity showed decreased Wnt activity and high levels of DKK-1." "Our results suggest that DKK-1 may act like a switch on prostate cancer cell activity," Keller says. "When we altered the cells to increa...

Cyberkinetics, Case to develop system to help restore extremity function

...ectrical Stimulation) FES is a method of applying low level electrical currents to the body to restore or improve function. A heart pacemaker is one example of an FES System. Another example of an FES System is one which employs an electrical current to restore movement by initiating muscle contractio...

Center releases new public survey on stem cells

...s believe that an embryo in a Petri dish has no or low moral status (30 percent) or maximum moral status ...f those who accord an embryo in a Petri dish no or low moral status nevertheless disapprove of ESC research and support the current ESC policy or an all-ou...

Removing egg from nest may help save endangered whooping crane

...n Texas. At one point the bird's numbers reached a low of 16 in 1942 but the population has since increased to more than 200 birds. Not only has the Wood Buffalo-Aransas population been enhanced by the egg removal program but removing the eggs has allowed the establishment of additional populations like...

2005 AIDS figures released by WHO and UNAIDS

...l. Levels of knowledge of safe sex and HIV remain low in many countries ?even in countries with high and growing prevalence. In 24 sub-Saharan countries (including Cameroon, Côte d’Ivoire, Kenya, Nigeria, Senegal and Uganda), two-thirds or more of young women (aged 15-24 years) lacked comprehensive know...

Earliest European Farmers Left Little Genetic Mark On Modern Europe

...l. Levels of knowledge of safe sex and HIV remain low in many countries ?even in countries with high and growing prevalence. In 24 sub-Saharan countries (including Cameroon, Côte d’Ivoire, Kenya, Nigeria, Senegal and Uganda), two-thirds or more of young women (aged 15-24 years) lacked comprehensive know...

Geoscientists follow arsenic from chicken feed to streambeds

...ater samples from streams receiving runoff is that low concentrations of arsenic are transported to streambeds instead of being retained by the aquifers, Schreiber said. "We think that the arsenic is adsorbed onto nanoscale particles that pass though our filters and through the soil column," said Schreib...

New class of antibiotics effective against drug-resistant bacteria discovered in fungi

...ater samples from streams receiving runoff is that low concentrations of arsenic are transported to streambeds instead of being retained by the aquifers, Schreiber said. "We think that the arsenic is adsorbed onto nanoscale particles that pass though our filters and through the soil column," said Schreib...

Male elephants woo females with precise chemistry

...hey also tested young and old males. It found that low concentrations of frontalin, represented when the enantiomer ratio is more "plus" than "minus," was of mild interest to both young and old males, but when the ratio became balanced - equal amounts of plus and minus frontalin - males of all ages, as w...

Storing carbon to combat global warming may cause other environmental problems, study suggests

...s paper is that those places tend to be relatively low rainfall areas. We predict we will see a decrease in stream flow particularly in these relatively drier spots that are targets for sequestration." Almost all plantation trees are heavy water using evergreen species such as pines and eucalyptus, he ad...

Gene controls whether fear is a factor

...earned fear. Mice without the gene show abnormally low levels of anxiety in situations that should instinctively inspire fear. Stathmin-deficient animals also show less reaction to conditions that have previously proven unpleasant, an indication that the mice lack a normal memory for fear. "While one of...

New technique multiplies life span in simple organisms

...organisms lacking RAS2 or SCH9 and at a remarkably low pace in organisms lacking both SCH9 and SIR2, raising the possibility that the mutations that cause human cancers can be delayed or prevented," Longo said. "Notably, mutations that increase the activity of human homologs of the yeast SCH9 and RAS2 g...

Katrina floodwaters not as toxic to humans as previously thought, study says

...ic life in the area, Pardue says. He believes that low oxygen levels in the water that is being pumped back into Lake Pontchartrain could result in fish kills. He also says that heavy metals being discharged into the lake, particularly copper and zinc, can be toxic to fish and other marine life and may b...

New view of cancer: 'Epigenetic' changes come before mutations

...igenetic changes look normal under a microscope at low levels of resolution, Feinberg says, "but if you look carefully at the genome, you find there are subtle changes." By tracking these changes, he suggests, doctors potentially could treat people before tumors develop in much the same way as cardiologi...

Researchers quantify more noise in gene expression

...icking in unison." Intrinsic noise resulting from low copy numbers of molecules has been the focus of earlier studies by Hasty's group. Its Nature paper focuses on extrinsic noise, an even larger source of variation between identical cells growing side-by-side in identical conditions. "This extrinsic no...

Penn study finds direct role for glial cells in brain cross-talk

...ls can suppress epileptic seizures. In contrast, low levels of adenosine increased the transmission of nerve impulses. The modulation of neuronal activity through the regulation of the level of adenosine in the synapse may explain the nature of wake-to-sleep transitions during periods of drowsiness. ...

How Fruitflies Know It's Time for Lunch

...ug expression by exposing larvae to either high or low food levels. Because both starved and sugar-fed flies express little hug, the researchers inferred that hug levels do not solely signal internal energy requirements but respond to internal and external signals carrying information about the quality o...

Software might revolutionize glucose monitoring in critically ill patients

...tored by GRIP. Only one patient suffered from very low glucoselevels, and that was due to human error. Nurses found GRIP easy touse and all agreed that it is an improvement over the paper-basedmethod. Because they only have to control patients six times a daywith GRIP, they can monitor more patients and ...

How does Mycobacterium tuberculosis infect the lung?

...rophages from a control individual (which had very low levels of DC-SIGN) and infected them with Mycobaterium under laboratory conditions. They found that shortly after infection not only the infected cells but also some of their neighbours started to display DC-SIGN on their surface. They also found tha...

Looking for the genes that affect a person's level of response to alcohol

...elates to their risk for developing alcoholism. A low level of response (LR) to alcohol, or the need for a higher number of drinks to feel intoxication the first few times a person drinks, is more likely to occur in children of alcoholics, and predicts a greater risk for alcohol problems. A study in th...

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